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Introduces a common `ZenServiceClient` RAII wrapper for zen CLI commands that interact with a zenserver instance. CLI operations (admin, builds, cache, exec, hub, info, projectstore, trace, ui, version, vfs, workspaces) automatically register sessions so they become visible in the server's session list, and forward log output to the server's session log endpoint.
All session HTTP I/O (announce, remove, log batches) runs on a single background worker thread, so CLI startup and shutdown never block on server availability.
### Key changes
- **`ZenServiceClient`** — new RAII class that wraps host resolution, HTTP client creation, and session lifecycle (register on connect, remove on exit). Replaces ad-hoc boilerplate across all command files that talk to a server, including the new `trace` subcommands (`start`, `stop`, `status`).
- **Async session I/O** — `SessionsServiceClient` now owns a single worker thread and command queue. `Announce()`, `Remove()`, and `UpdateMetadata()` enqueue commands and return immediately. The worker creates one `HttpClient` with a 5-second total timeout, bounding any individual request. Eliminates main-thread stalls when the server is unreachable.
- **Session log forwarding** — `SessionLogSink` is a thin enqueuer that posts log messages to the same worker queue (no separate thread or HTTP client). Log levels are serialized as integers; the server-side ingest handles both string and integer formats for backwards compatibility, with bounds checking on integer values.
- **Build & projectstore session registration** — Long-running `builds` and projectstore cache (oplog-download) connections register sessions too, making them visible alongside regular CLI command sessions.
### Cleanup
- Extract `SetupCacheSession` helper on `StorageInstance` to reduce duplication.
- Remove unused `HttpClient` reference in ui command.
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## Summary
This PR adds a session management service, several new dashboard pages, and a number of infrastructure improvements.
### Sessions Service
- `SessionsServiceClient` in `zenutil` announces sessions to a remote zenserver with a 15s heartbeat (POST/PUT/DELETE lifecycle)
- Storage server registers itself with its own local sessions service on startup
- Session mode attribute coupled to server mode (Compute, Proxy, Hub, etc.)
- Ended sessions tracked with `ended_at` timestamp; status filtering (Active/Ended/All)
- `--sessions-url` config option for remote session announcement
- In-process log sink (`InProcSessionLogSink`) forwards server log output to the server's own session, visible in the dashboard
### Session Log Viewer
- POST/GET endpoints for session logs (`/sessions/{id}/log`) supporting raw text and structured JSON/CbObject with batch `entries` array
- In-memory log storage per session (capped at 10k entries) with cursor-based pagination for efficient incremental fetching
- Log panel in the sessions dashboard with incremental DOM updates, auto-scroll (Follow toggle), newest-first toggle, text filter, and log-level coloring
- Auto-selects the server's own session on page load
### TCP Log Streaming
- `LogStreamListener` and `TcpLogStreamSink` for log delivery over TCP
- Sequence numbers on each message with drop detection and synthetic "dropped" notice on gaps
- Gathered buffer writes to reduce syscall overhead when flushing batches
- Tests covering basic delivery, multi-line splitting, drop detection, and sequencing
### New Dashboard Pages
- **Sessions**: master-detail layout with selectable rows, metadata panel, live WebSocket updates, paging, abbreviated date formatting, and "this" pill for the local session
- **Object Store**: summary stats tiles and bucket table with click-to-expand inline object listing (`GET /obj/`)
- **Storage**: per-volume disk usage breakdown (`GET /admin/storage`), Garbage Collection status section (next-run countdown, last-run stats), and GC History table with paginated rows and expandable detail panels
- **Network**: overview tiles, per-service request table, proxy connections, and live WebSocket updates; distinct client IPs and session counts via HyperLogLog
### Documentation Page
- In-dashboard Docs page with sidebar navigation, markdown rendering (via `marked`), Mermaid diagram support (theme-aware), collapsible sections, text filtering with highlighting, and cross-document linking
- New user-facing docs: `overview.md` (with architecture and per-mode diagrams), `sessions.md`, `cache.md`, `projects.md`; updated `compute.md`
- Dev docs moved to `docs/dev/`
### Infrastructure & Bug Fixes
- **Deflate compression** for the embedded frontend zip (~3.4MB → ~950KB); zlib inflate support added to `ZipFs` with cached decompressed buffers
- **Local IP addresses**: `GetLocalIpAddresses()` (Windows via `GetAdaptersAddresses`, Linux/Mac via `getifaddrs`); surfaced in `/status/status`, `/health/info`, and the dashboard banner
- **Dashboard nav**: unified into `zen-nav` web component with `MutationObserver` for dynamically added links, CSS `::part()` to merge banner/nav border radii, and prefix-based active link detection
- Stats broadcast refactored from manual JSON string concatenation to `CbObjectWriter`; `CbObject`-to-JS conversion improved for `TimeSpan`, `DateTime`, and large integers
- Stats WebSocket boilerplate consolidated into `ZenPage.connect_stats_ws()`
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